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G4PhononReflection.cc
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25 //
28 //
29 // This process handles the interaction of phonons with
30 // boundaries. Implementation of this class is highly
31 // geometry dependent.Currently, phonons are killed when
32 // they reach a boundary. If the other side of the
33 // boundary was Al, a hit is registered.
34 //
35 // $Id: G4PhononReflection.cc 76799 2013-11-15 20:30:53Z mkelsey $
36 //
37 // 20131115 Throw exception if track's polarization state is invalid.
38 
39 #include "G4PhononReflection.hh"
40 #include "G4ExceptionSeverity.hh"
41 #include "G4GeometryTolerance.hh"
42 #include "G4LatticePhysical.hh"
43 #include "G4PhononLong.hh"
44 #include "G4PhononTransFast.hh"
45 #include "G4PhononTransSlow.hh"
46 #include "G4PhysicalConstants.hh"
47 #include "G4Step.hh"
48 #include "G4StepPoint.hh"
49 #include "G4SystemOfUnits.hh"
50 #include "G4VParticleChange.hh"
51 
52 
54  : G4VPhononProcess(aName),
55  kCarTolerance(G4GeometryTolerance::GetInstance()->GetSurfaceTolerance()) {;}
56 
58 
59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
60 
61 // Always return DBL_MAX and Forced. This ensures that the process is
62 // called at the end of every step. In PostStepDoIt the process
63 // decides whether the step encountered a volume boundary and a
64 // reflection should be applied
65 
68  *condition = Forced;
69  return DBL_MAX;
70 }
71 
72 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
73 
74 // This process handles the interaction of phonons with
75 // boundaries. Implementation of this class is highly geometry
76 // dependent.Currently, phonons are killed when they reach a
77 // boundary. If the other side of the boundary was Al, a hit is
78 // registered.
79 
81  const G4Step& aStep) {
83 
84  //Check if current step is limited by a volume boundary
85  G4StepPoint* postStepPoint = aStep.GetPostStepPoint();
86  if (postStepPoint->GetStepStatus()!=fGeomBoundary) {
87  //make sure that correct phonon velocity is used after the step
88  int pol = GetPolarization(aTrack);
89  if (pol < 0 || pol > 2) {
90  G4Exception("G4PhononReflection::PostStepDoIt","Phonon001",
91  EventMustBeAborted, "Track is not a phonon");
92  return &aParticleChange; // NOTE: Will never get here
93  }
94 
95  // FIXME: This should be using wave-vector, shouldn't it?
96  G4double vg = theLattice->MapKtoV(pol, aTrack.GetMomentumDirection());
97 
98  //Since step was not a volume boundary, just set correct phonon velocity and return
100  return &aParticleChange;
101  }
102 
103  // do nothing but return is the step is too short
104  // This is to allow actual reflection where after
105  // the first boundary crossing a second, infinitesimal
106  // step occurs crossing back into the original volume
107  if (aTrack.GetStepLength()<=kCarTolerance/2) {
108  return &aParticleChange;
109  }
110 
111  G4double eKin = aTrack.GetKineticEnergy();
114 
115  return &aParticleChange;
116 }
117 
118 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
119 
120 
G4double GetKineticEnergy() const
G4double GetStepLength() const
G4double MapKtoV(G4int, G4ThreeVector) const
void ProposeVelocity(G4double finalVelocity)
Definition of the G4LatticePhysical class.
const G4double kCarTolerance
G4double condition(const G4ErrorSymMatrix &m)
G4PhononReflection(const G4String &processName="phononReflection")
void ProposeNonIonizingEnergyDeposit(G4double anEnergyPart)
G4ParticleChange aParticleChange
Definition: G4VProcess.hh:289
virtual G4VParticleChange * PostStepDoIt(const G4Track &, const G4Step &)
double G4double
Definition: G4Types.hh:76
G4StepStatus GetStepStatus() const
virtual void Initialize(const G4Track &)
const G4LatticePhysical * theLattice
Definition: G4Step.hh:76
G4StepPoint * GetPostStepPoint() const
virtual G4double GetMeanFreePath(const G4Track &, G4double, G4ForceCondition *)
void G4Exception(const char *originOfException, const char *exceptionCode, G4ExceptionSeverity severity, const char *description)
Definition: G4Exception.hh:65
std::map< G4String, G4AttDef > * GetInstance(const G4String &storeKey, G4bool &isNew)
virtual G4int GetPolarization(const G4Track &track) const
G4ForceCondition
const G4ThreeVector & GetMomentumDirection() const
#define DBL_MAX
Definition: templates.hh:83
void ProposeTrackStatus(G4TrackStatus status)